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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6876be40412a1c066ef5e4526375c6f39374e4957257ad3c8b9d441f286ee2f1' 
  AND token = 'rOAOjIarNWcu4xJjK4Q35qyZtG0J310TuT+J/nDcxAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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