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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56f7356f2fa06a2b3fd8a922aca3a2648112bb1f69b635e7c45c1eac8e86a8d3' 
  AND token = '7uNY8bLcHQ7u6Amf7G7HEaiYhyApdpURAfyu+7Y7ZKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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