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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bc6cb38997a7d9e8398670324c9a5998fec1f952ca0c0f74f916e6b41e7b4a7' 
  AND token = 'kt469wo/HmFv7aOgsXlDg3qqKsQnzAOi+2bdFCFBI6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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