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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da757caf031c3d314ea910bfc3e8c20a9fe69fbe36ce14a8b47ff4bdd0403372' 
  AND token = 'hgJ0YTtYcP97t0fX8mCDpisxkPJRHHVUqyk2xRHw9XI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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