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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a7b65a0c30245cb51fc6eac8d7ea5e28a3d7434b27c7b15f2db2daba934554e' 
  AND token = '6iWKsbgtEXk9v1hoHVUp3s2BDh88YKXbArHupv4RhLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}