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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52d0b6d31c8d87968ee694712f797930519ce585a73f60b2feaea0d558c34fbb' 
  AND token = '1PrCkWbVgZxHxEEnkL26uSsPI6TkwDfwHThvmUK2s6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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