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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d4494ade9f38de400ba303338e795d9f62b778dc886a38a584c7f07c6c6f7b6' 
  AND token = '03OMdoFE4/0+uBWyzzx+9L5aWsOG9ec2myfBCs7eJao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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