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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c76346c6fed88c01bbe6dbc989f00c8897ee6a9d93b029bce3f85a630cdc859c' 
  AND token = 'h5SBFNIEF/UQxZ3BbABskKZHDHryb50BgWIK3EUKo+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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