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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83c32e14cf701c0509a1ae73f9ea7e4593312c757e37e3ca4e98ced2b0998fce' 
  AND token = 'Ul6kZIp3dQC7HKwItVzUl6eLGSc65e67c7JlV6HUhP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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