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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d7fd83d6650c556fcf41b17dfae11747ffcec35391b9dcb4199d9e1e91e6e1f' 
  AND token = 'qiGLi7VCybHW9Vg5fZDIH8+Y9aYOAjbgi4E8fCwFJoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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