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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f11ea400384dfd57a4b0b12d760bfd5b3959c6fd44a8eb391d040e00e6e71dbc' 
  AND token = 'M/m4VFwMHKkNTYS2vWYnhm0ki0IT34CREC1d8v9Vve8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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