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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a9dee847957c7c1fd4766ddfa6a3ea8c4dbd9677d7f8631b1e7a854f556295c' 
  AND token = 'vsmYvFKT4ACjisQJManff4jmNXcSaHGTS7ZJ6jbGuCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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