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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f7d0b537f14a12a36f14fca8ac25a61fd7bc4e28c7b6114e48f923a5bdc4641' 
  AND token = 'hE5cxHHitO8cl5RbQxEmE4Km2wQ1xy3ByJvRvSZnr/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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