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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8efd2dcb9fc1dc68c619a55d92a7debdc40296d8c373cae77966e34f56a7bd57' 
  AND token = 'rXe4rd+o2ZtP4pa7y3S618zLKEo5i4Jz/MgUHDwTAbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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