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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41bca23c0ade82df92109feeb2e68e85dcae0de9cfe05ab981f2ab8702aa2069' 
  AND token = 'Dg8yHPYNdyvPrDwX4DIUB+Cn7lJF9P5dHg8ajpM9TYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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