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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c08bb6abfbf3f18409e0bbd18aedf1b21562a4b0e3dbe3d44943859a6c36e5d7' 
  AND token = 'Ccm8U6DbkR6aU3IFjI8QwX9kN9p00mGDtRdmzRoCUFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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