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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '314c138374b2b59c6d3599a34d08cad3f59d32bb383e0731a8cae22e7cbcdd4d' 
  AND token = 'Opk2Y99utmF8RT7JIkPiQ4ouJPfF4UebzlHlh2B0oXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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