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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8be352369490d303330e57988aa340b86bc1ce2ab97715544bf0d22f746b0d43' 
  AND token = '4wpYaY4vheXWtkKtw6t8RtTlCKgO0Sa3nmIXGl+RJk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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