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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06b21eefe4dad6691fb4f66c15cbc2519c98607c6fc3091db9b1cd18532a5067' 
  AND token = 'LrSGgUTADJRxKRgkPl9xOsv0NH9sBveKeLTR0w0dI2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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