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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4f82e44f456c44d09c386cf1c8abfa358f7c898bb46e5074efc665e194ef368' 
  AND token = '/v/+dAYFD3EaecqvBAUgeYhCOlcEbrQ6rXb345XXJ3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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