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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b598e17e1b9089ec15f5de49b3e7d1f880518e17c8e80937c8b376191c3b11ce' 
  AND token = 'hzaHK1DFNxG962lqpliuVjCKO1phEoUIGKoHKe/TVPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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