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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0cb0bf79c6428e093b5a0397de2d1ec6c5fee538f4f45efa0cb581e7a3a223c' 
  AND token = '0XeedhdHqzi7rrExGR7GMg3DQU883A/N7AD31UGM20A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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