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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dadf7d758af5bc3ec5e79f46aab76ca6440bb24e4dce42bdac912c647566d5c' 
  AND token = '6rho3T6vvwVo45EtfUWdCoWtdUyUfOu/IOeFDUc7s8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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