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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb56b240a8b69aa2611f54c17cbb5ad925bbb1b5b2b7d953763159a825b5a9d6' 
  AND token = 'PQpgtlDAuQXmPSDwPJVCVrwwFfvXR++wmN1hclbIEzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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