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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d83ca858399d68564aef17c1dec5af2d23c670556302d63dfc5b9f3a5fc7f63' 
  AND token = 'G4PsB4YCLP2eNjut4QyXu42X2Gv8kWKZRxAwC5g4WvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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