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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19c8ebd51492c92522a2110398de0d574c1029d98da0eda7c4bf20b174d451a2' 
  AND token = '9vOTSOnZRHMuiDJU6tmkuMvJUPfzf53xduNT+/U9qg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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