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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f26d4aa387ee9f1af6045ef2ff8b7828e1500c3415915560d1835b67de937457' 
  AND token = 'Mm4i0xdFQjSosKEXtJJp3xgD9uKgZK6xK7+Z8gF3nao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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