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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85f44f44624eee43ab652c5aab7df79f3ec5e9fe75b1875676ff3c1ba7a059c6' 
  AND token = 'iPLD1ktFW0Hsqqg44yAtLYmFngJG8vv1ZEbYvne/6sA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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