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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6af169a38261883b6959878ba5b824f8f725e14c808c7dbbcf5610368162f58' 
  AND token = '8AoejeM7Z4biEylRKALETCVYTgUSnnlLCnfXGf6FIjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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