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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cd33e7787ddb15480913f99c7d86812c3cf59e8ad707c7e6388dc63ce5d4176' 
  AND token = '6/N/zsmwKoNQOOABzrqIIFETllw9NhyjkLTAcfB74YY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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