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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0bc3445881566c8e5ce413196569080f91cc6eb4999fd37a694fa92bd1c059d' 
  AND token = 'ziu2tI+rPB/dZnr6f6z0An8Z/fnhkxyMxvo16Y+z2bU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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