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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56ec5c5d33d18e0f41aae81de6ab0d3657e47823a4e289ee7beac85e36ca5dad' 
  AND token = 'E8PilLGc+KVV3DpubPshtDjo47u/9IEqrTcDK6HDF2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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