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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78613fca6ec7583df8970030ddf5dc7fced255fd6b634c09b8b0bf0e8ad11062' 
  AND token = 's2OCKDNoYmZsuD5U2ENGvqAz7v9cdovss5ybPi+PZTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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