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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01ed77a5a8f09c7fc56eb5cb6974f2c82e30ae5eb617b1c3d3672be2c45b77bd' 
  AND token = '6RIqti0taZyTv/yOYfRQZjirhJenljwSlLXZVaxWxwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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