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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db3c43357d37babe42aa3b071a6f3d580d46663069c6dc9e83b9ea2b60ab294e' 
  AND token = 'EPnWkIa/L0jUiZsPJozIY5RB3pEERX0MofleNQX1eNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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