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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd4abec6a9dbc0a8b508e9974986f391f1e51955d0f9e20b7a47366e9cbda2d0' 
  AND token = '1fukitUfzOKVXoBQKxvDaBQV9Lw8k0WVrrV7E/MCDYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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