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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73c16cad1d101319f4924c2fd57bc61077c5d61fb8d2f1714d283cfca6fdd47a' 
  AND token = 'n72mEHP48pMAFe6WGor1PP562Lj/O0Ogswz0X/U4eIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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