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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2cb94dd58dbeb9221ec40d209760e272b9d79e6f2f1b58c3d64673e4664af10' 
  AND token = 'tvGNZkkCa1cTz/ExSi3pK4qmZNSZ/6iSg0p7/EfL6JY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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