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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04155726f65703ce58f8ed36b2f0eb86ff51bd8352cff86695168f047dd9da4e' 
  AND token = 'uvKX4osiHcS7J2pSl0/zHlx3ndaYZ1RjDEW2zCUntIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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