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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9fe6b64b5fe39a26bacdc22e272168b5ea5a3bb88c461cfff2e21a4e5d3730c' 
  AND token = 'fSun9lc/cSqhGbh8Ix9xxpEjfSh25EdauhgOCYVFi1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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