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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69bc73daa100267cde5885ff0cfaa741bf36fc3f14bb029a5f2e8bcbc95717f5' 
  AND token = 'DpmJHQpAiAm2ZdlNv0+niD8F0AVleFbPpkT2U0UUXx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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