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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07c266224d7db857ce9c9485662eef7161f70a07282d9979897f3c419eb89b0d' 
  AND token = 'OgUiO6w1Wrdi4zi5UgVPhuc4q4m1ZQLafC7+eccgq9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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