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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5706159b5b27875cf41ef627b30e0d3f97c55b14518740f9e5c13320ae853727' 
  AND token = 'CYPOmSZbxM1s0bwWCnqw3V7srdfzTxU2cLbT9PbJNZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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