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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c02e79c152c48b2e6d4f0d26c15c0db7984e9c9d46d48f159e731edd0f40f001' 
  AND token = 'Vij8lJEDk1kCW6+Gaoj+FtRnDz1F1Zh8fbaVg0d8v5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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