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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74f6eed719c79b683d4f6da8a9205b2518114e2e6e17cf74c03e796ce95930ed' 
  AND token = 'kZkGr2vkhHT6pRNKBxLRgSlkf1x7YmqizW4OUrTAf+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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