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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba84ea8b60d22f23d01d2168f854bf55d7a3ed2385735466f22c6f9a2ef05425' 
  AND token = 'XQ9oU7tkWvfuLgbLNnGJxaVCqcy8HNLGz1tNbLCrYxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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