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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e995c1ced1fbf75e1232e8579493d83f8f5160747f0ad17628ce0ba5dffc2464' 
  AND token = 'BlCNP5WCRkpVk76CaDNEsWQiMzRr1v67Fr1Rq2u5y1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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