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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0b9833e310680f9451684d11b1d6ccb876fa6a2ef4d8fdbd78fdcb431d7d80b' 
  AND token = 'RcRCg9/bVUln4TBqueMzDGtR97eDqN5FALhVXMuDD/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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