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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbed66babe9b8575a9cd7173eaf25048a18b495eca8d969c97778c407433e2bd' 
  AND token = '48BxMA7Te2W7prsbn97heaaL7YdZsTXi+EiH2qCkci4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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