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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd26f8688f6f136ca446ebbeaa280ed7199a128d2d7b4b967229caef081914086' 
  AND token = 'gH8Z0auY6OoUDF/0U959aXw0X7yy9DStDHilIS2BwwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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