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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '105d27e75a5778e7c1df92afbfb5cb70919cf7efe6f9593968e3bff4af68b64c' 
  AND token = 'hdvfInCvGREXJutCgrG4T7ArmOPzVRvZB196cBVkZn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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