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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a176c1527eb4594d17123166c74b5de6ff55bc4b0ae9021e0cbcd7f1ff071bb8' 
  AND token = 'Syf7iuSy2OXSdgRwcRmZowp36JqMz2jaRkQtEbhciHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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