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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '507ba8f3a66de729be09dad163c005f73dba502b0751d7d3ae777afb671ac9fe' 
  AND token = 'xp+JvyGJZ9gD7pj50lYbm4tEgqAWpqi8nZMVo21JChc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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