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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e30846bd22a39c95c393a00d8be898c098453cad4b9c42dedf2f0b5e480d8df8' 
  AND token = 'QmilIOSK0SCgirTCwGijRL4iuS6SVdJkqQSuZrAqOD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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