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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f430f1dcf9e882441d0f6055ab6b42a75468593af79386028d7f15aeb6d99c61' 
  AND token = 'ZZfWk3f6Vr7YZN/UU5syvUdG/M5AukJhTEMFx7za8As=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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