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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '778a6ef30fee0e3f12cbb0f8ad4af0c2c4101ed6e9ddc68a7fcfd9d528a3155e' 
  AND token = 'Duw3bIOI77GHUbZQjkJjb+wCbeYYw6isWKGJA3sm9Gk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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