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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f57c1f20effdc981678c19552c38960ba8537d03e12a145d8361384d26257af7' 
  AND token = '32wQTVbnluDS1OzSsW7w3XlLbcxfnggKI95WtyY7Qy4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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