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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ec937ef74fba959b75e3f8e1ab1ea02ad5fc055856c90ec08654c08500d5215' 
  AND token = 't5KS+sW3T/QNKNN8zY+jni+dsvlOTNIEKPqouawOZ+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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