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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3175af0875a38cab722008cabe70a9b30fcb5f1f255c64ce65fa627d46995f45' 
  AND token = '7GoRqMeaid03yJpMhH+xSR/lZw5DFmGZnWaW12VcDUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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